Grindinq-mill



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' O.-H. BROWNB. Grinding Mill.

No 239,435. JlPatented March 29,1881,

WITNEEE-Es InvsnTin- I 1 zsneec-sn'eet 2. 0,11. BROWNE.

Grinding Mill; No. 239,435. arch- 29 I881.

Patented M r+ INYENTDE 'XZYITNEEEEE Y U ITED STATES.

PATENT OFFICE.

CHARLES H. BROWNE, OF JACKSON, MICHIGAN.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 239,435, dated March29, 1881.

Application filed September 23, 1879.

To all whom it may concern:

Be it known that I, CHARLES H. BRowNE, of Jackson, in the county ofJackson and State of Michigan, have invented certain new and usefulImprovements in Grinding-Mills; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference bein ghad to the accompanyingdrawings, and toletters of reference marked thereon, which form a part of thisspecification.

Figure 1 is a side elevation of my improved mechanism. Fig. 2 is atop-plan view of the same. Fig. 3 is a vertical section on line ay ofFig. 2. Fig. 4 is a horizontal section on line as 3 Fig. 1. Fig. 5 is anenlarged view, partly in side elevation and partly in section, of thebail and upper end of the spindle. Fig. 6 is a View of the trammingdevices enlarged. Fig. 7 is a view, partly in elevation and partly insection, of the spindle and hail when the stone is loosely mounted. Fig.8 is a partial plan view of a detachable ring around the bedstone.

In the drawings, A represents the floor, immediately above which thestones are mounted.

The frame in which the operative devices are. supported is constructedof the uprights B B, the sills O G, and the beam 1), through whichpasses the step of the spindle. These parts can be varied as convenienceor location may demand without affecting the material parts of myinvention.

D represents a supplemental cross-beam, which I attach to the frame, fora purpose to be fully hereinafter described.

E is the spindle, through which rotary motion is transmitted to therunner stone. The spindle is shown to be supported, in the ordinarymanner, in a step, c, which rests upon the lighter lever E.

E is the screw-rod, and E the not for adjusting the lever E and thespindle E. The step is adjusted laterally by means of follower e and theset-screw 0 arranged to bear against the follower, which isformed with ashoulder adapted to rest upon a fixed plate, a attached to the beam D. a

F represents the bail or balance-rynd. It is constructed substantiallyin the form of a hollow cone, and is provided at or near the bot fitinto corresponding recesses in the wall of the eye of the stone. upperend of the bail projecting inwardly, as shown at f.

G is a detachable circular head, having a shoulder at g, adapted to fitunder and engage with the flange f. The upper cylindrical part, 9, ofthe head G has a diameter shorter than the opening through the flange f,and there-- through the center of the head G and engaging therewith.This screw is arranged to fit into a recess or eye in the upper end ofthe spindle, as shown in Fig. 5.

I is the driver, situated near the bottom face of the runner and adaptedto engage with the bail F. In the construction I have shown this en gagementis produced by an annular plate, I, situated around the spindleand provided with grooves or recesses z in its under side, with whichthe arms of the driver engage. This plate or ring I may be rigidlyattached to or formed with the bail F, or it may be madein a separatepiece and held in place by means of set-screws t" t", passing throughthe bail and impinging against the perimeter of the plate or ring I.When a detachable ring is used it should have a shorter diameter thanthe bail, so that it (the ring) can be adjusted laterally by the screwsz" 13.

By an examination of Figs. 5 and 7 it will be seen that the grooves orrecesses 11 in the lower face of the plate I are of such depth that theplate can be raised some distance above the position shown in Fig. 5,and yet engage with the driver I, and that, owing to the tapering formof the spindle just above the driver and its size relative to the holein plate I, the plate will fit the spindle closely when the parts are inthe position shown in Fig. 5; but when the stone has been raisedrelative to the spindle by means ofscrew H there is an annular spacebetween the spindle and the plate, which permits the stone to rock tomwith two or more heels, f f, arranged to There is a flange at theslightly about the spindle. It will also be seen that when the stone islet down and the plate I fits the spindle closely the plane of thegrinding-face of this stone (the runner) relative to the spindle may beadjusted by means of the set-screws t" and plate I.

I is a band placed around and fitting lightly to the outer face of therunner-stone.

The stationary or bed stone K is supported vertically by the followingdevices:

K is a wide annular plate extending from the eye of the bed-stone to aline considerably beyond its skirt, and upon this plate the bedstonerests, the stone being vertically ad justable by means of screws 70 k.

K is the bush, having the usual followers, 70 k, and adjusting-screws,70 k around the spindle.

The plate K is supported on three or more bracket-arms, L L L, the outerand upper ends of which are secured to the under side of the plate K,and the inner ends of which converge toward the spindle. Said lower endsare attached rigidly to a flanged sleeve, L, which is placed around thespindle, and which is laterally adjusted by means of screws Z Z. Theflanged bottom I of the part L rests upon the beam D, and therefore, aswill be readily seen, the said beam supports vertically the plate K andthe bed-stone K. The set-screws I bear upon a sleeve or bushing, Z whichis interposed between the part L and the spindle, the opening throughsaid part L being larger than the bushing, to permit the lateral adjustment of the lower ends of the bracket-arms to adjust the plane of theupper face of the bedstone.

M represents a band fitted tightly around the bed-stone.

M is a ring placed loosely around the band M, there being a flange, m,formed with the ring, through which set-screws m are inserted ameter aswill insure that it shall pass easily over band M, the space between thetwo rings being calked, when necessary,to prevent meal from passingbetween them.

I is a loose ring placed around the runnerstone, and secured thereto byscrews i It is provided with adownwardly-projecting tongue, 1 arrangedto tit and rotate in the groove m in the ring M.

The bed-stone is adjusted horizontally by means of set-screws O O, whichare mounted in a band or ring, 0. The ring 0 is supported at a properheight by means of legs or standards 0 O Heretofore it has beencustomary to so arrange the set-screws which adjust the lateral positionof the bed-stone that their points should come directly in contact withthe side of the stone. This method, however, has been the cause of muchinconvenience and erroneous adjustment, for the reason that the screwtends to lift up or press down the stone on the side where it bearsagainst it, and thus throw the stone out of its proper position. Inorder to obviate this difficulty I place a roller at the point ofcontact with the stone, as shown at 0. These rollers may be attacheddirectly to the screw-shaft, or preferably they may be pivoted to anindependent shank mounted in the socket of the set-screw. There shouldbe a feather or its equivalent to prevent rotation of the rollershank.When these rollers are used it is impossible to lift up the stone bythrusting in the screw, inasmuch as they permit the stone by its ownweight to preserve its proper posi tion.

In order to ascertain whether the grindingfaces of the stones be inproper positions relative to each other, and also to ascertain at anytime what the distance is between said grinding-faces, I insertvertically two or more screws, P P, in the ring 1 and insert anupwardly-projecting screw, P, in the ring M, attached to therunner-stone.

The method of operation with these devices is as follows; The faces ofthese stones are made true and level, and the runner is supported abovethe bed-stone, so that it can be easily rotated thereon. The point ofthe screw P is brought up and the points of the screws P P down untilthey are all in the plane of the point of the screw P, which plane isparallel to the faces of the runner and the bed-stone. If at any aftertime it be found that the points of the upper screws are not revolvingin the plane of the point of the screw P, it will be known that thegrinding-faces of the stones are not parallel and that adjustment isnecessary. The screws P and P can also be used .to find the distancebetween the stones at any time, inasmuch as the number of revolutions ofthe screw P will depend upon the number of its threads to the inch, andthus the distance from any given position of the screw P to the plane ofthe points of the screws P P will be accurately indicated by the numberof the revolutions of the screw P necessary to carry its point up tosaid plane. Power is applied to the spindle and the runner by means of aband-pulley, T, or by suitable gear.

It is well known that great trouble is experienced in grinding-millsfrom the uneven movements of the driving machinery, which produceresults very detrimental to good grind- Many means have been devised toobviate the difficulties met with from backlash in driving millstones,such as automatically-adjustable drivers, 850.

I have invented and shown an improved device for transmitting the powerto the stone, which entirely avoids the necessity of the in- IIOtermediate devices heretofore employed. The motion is transmitted by aspindle formed in two parts, or by a combination of devices so with thestone, said part being arranged to antomatically engage with each otherwhen the wheel is moving with a speed equal to or greater than that ofthe stone.

S represents a disk or plate around thespindle, and secured to the sameby set-screws or otherwise. On the upper side of this plate there is adog, 8, pivoted thereto, and a flat spring,-s, bearing against the dog.

T is the baud-pulley, mounted loosely upon the spindle. l

T is a sleeve projecting downwardly from the pulley and resting upontheplate S. At the lower end there are ratchet-teeth t, with which thedog 8 engages when power is trans- -mitted from the pulley through theparts T and E. And it will be seen that-when the speed of the wheel Tslackens below that of the stone the parts T and t of the transmittingdevices slacken with the wheelT and the part E moves with the stone.When the speed of the wheel comes up to that of the stone, the parts Tand E automatically engage through the dog 8 and teeth t, and power isagain applied directly to the stone. To avoid any sudden increase ofpower upon the stone, I provide the dog 8 with a slot, 8 whereby it canmove longitudinally backward, and I place a spring, 8 of suitabletension, back of the dog, which spring receives the increase in impulsebefore it can be felt by the stone.

From the description hereinbefore set forth it will be seen that I haveenabled the ready adjustment of the runner regardless of the bed-stone,of the bed-stone regardless of the runner, and of both stones together.

Arunner-stonemountedinthemanner shown can be driven loosely -that is,arranged to oscillate freely in any direction relative to the spindle;or it may be driven stifl -that is, with two bearing-places upon thespindle, and therefore fixed relative to the spindle.

When it is desired to run the stone loosely on the spindle it is raisedby means of the -screw H until the ring I no longer bears against thespindle, the only bearing-point then being at the point of the screw H.If, when the stone is thus running loosely, it be found that the driverI is driving unevenlythat is to say, if only one end of the driverengages wiih ring I when the stone is in perfect balance--the difficultymay be largely remedied by shifting the position of the ring and lookingit in its new positioi by means of the set-screws t" i.

When it is desired to run the stone stiftly on the spindle it is firstraised, as above described, and balanced as if it were to run loosely.After it has been balanced it is lowered until the ring I bears tightlyupon the spindle, in which position the stone will still be in perfectbalance.

Should there be soft spots or places in the grindin g-face of therunner, the stone will wear away on the side where such soft placesoccur more rapidly than on the other. This necessita-tes that the stoneshould be so adjusted as to bring it down upon the worn side, whichadjustment 1 readilyaccomplish by means of set-screws g g and themovable head G or the adjustment may be made by means of setscrews 4;and ring I at the bottom of the bail. The main purpose of said ring I isto provide an adjustable engaging device for the driver.

V V represent a detachable curb or cover for the stone, constructed andarranged to prevent any interference with the proper movements of thestone, and to prevent any entrance of foreign material between thestones. It is constructed with an annular side piece, V, and a curvedtop, V. It is supported by means of legs X, (see dotted lines, Fig. 1,)arranged to fit into sockets m in the top of the standards 0 0 By thussupporting the curb upon legs X, I provide that the miller may haveaccess to the screws 1? i m without disturbing the position of the curb,it not being necessary that the lower edge of the curb shall be incontact with a fioorin g or deck at the lower edge of the runner todirect the discharge of the meal, that result being accomplished by therings I M, the latter being provided with a discharge-opening, m (SeeFig. 8.)

What I claim'is 1. In a grinding-mill, the combinatiornwith the spindle,of a runner-stone, and means for making the same vertically adjustableindependently of the bed-stone, and means for making the same rigid withthespindle, a nonrotating bed-stone, and mechanism connecting thebed-stone with the spindle, substantially as described, whereby when onegrinding-face is moved into a different plane the other grinding-face ismoved into a parallel plane.

2. In a grinding-mill, the combination, with the spindle andthepower-wheel, of the ratchet, the slotted dog 8, and the spring ssubstantially as set forth.

3. The combination of the runner-stone, the bed-stone, the verticalscrews P P, and the screw P, substantially as and for the purposes setforth.

4. The combination, with the runner-stone and the bed-stone, of ring 1the ring M, and the tongue or flange 1 substantially as set forth.

5. The combination, with the bed-stone, of the ring or band M, the ringM, provided with the downwardly-projecting flange m, and set-v screws m,substantially as set forth.

6. The combination of the rynd F, head G, screw H, spindle E, andset-screws g g substantially as set forth.

7. The combination, with laterally-adjusting screws 0 0 and thebed-stone, of the rollers 0, substantially as set forth.

the tapering spindle E, of the ring I and radial set-screws i i,substantially as set forth.

11. The combination, with the grindingstones, the adjustable ring 0, andstandards 0 for supporting said ring, of the detachable curb or cover V,provided with the legs X, 15-

supported upon the standards 0 O substantially as set forth.

12. The combination, with the two millstones, of the ring I and therings M M, provided With the opening m for the discharge of 20 the meal,substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this26th day of d August, 1879.

CHARLES H. BROWNE. Witnesses H. H. BLISS, JOHN S. BARKER.

